Floyd Mayweather Jr. may fight again on Sept. 14 (Las Vegas News Bureau via AP)Two short emails released to the media Tuesday by Keith Kizer, the executive director of the Nevada Athletic Commission, seemed to ignite yet another dispute between powerhouse promoters Top Rank and Golden Boy.

On Tuesday, Top Rank formally requested the date of Sept. 14 for a pay-per-view fight at the Thomas & Mack Center in Las Vegas between Juan Manuel Marquez and Timothy Bradley. As soon as that was released, though, Golden Boy CEO Richard Schaefer said his plan was to have Floyd Mayweather Jr. fight on that date at the MGM Grand Garden.

Both promoters, as well as the casinos, covet the Mexican Independence Day weekend date.

Mayweather is boxing's biggest star, and if he chose to fight, the Las Vegas casino industry as well as the cable and satellite operators, would likely side with him over any other fight. Mayweather does big business.

Timothy Bradley rallied from a knockdown to defeat Ruslan Provodnikov on March 16 (AP)Don't, though, expect there to be two major events in the city as there were in 2012. Las year on Sept. 15, Top Rank put on a pay-per-view show

A recap of the highest-profile boxing matches of the weekend.

Canelo Alvarez, right, throws one of the lunging rights that he threw too often against Austin Trout. (Getty)

A work in progress

In Canelo Alvarez, what we have is a strong, young, gifted fighter who is just beginning his championship journey.

But what was on display Saturday night in a super welterweight title unification bout at the Alamodome in San Antonio was much of what the young slugger from Mexico lacks.

In defeating sneaky southpaw Austin Trout , which is no easy task, Alvarez did enough to claim a victory on Showtime that was a much closer fight than whichever one most of the ringside judges witnessed (official scoring: 115-112, 116-111, 118-109). But hey, at least they got the result right.

For Alvarez (42-0-1, 30 KOs), he now has an opportunity to take a good look at himself and tally the things he needs to improve upon. At various times during the bout, his ability to cut off the ring, his footwork, his conditioning and his combination punching came into question. True, Trout had much to do with that, but if Alvarez wants

Tamerlan Tsarnaev, the Boston Marathon bombing suspect who died early Friday following a shootout with police, was an amateur boxer of some note who had considered turning pro.

He won the New England Golden Gloves tournament in 2009 and 2010, though he only competed in the National Golden Gloves finals in Salt Lake City in 2009.

Tamerlan Tsarnaev (L) fights in the 2009 Golden Gloves (Getty Images)Edwin Rodriguez, a highly-rated professional super middleweight, sparred with Tsarnaev in 2010 and said he broke Tsarnaev’s rib.

“We had a baby [Evan] born on Monday, which was April 15, and we were in the hospital that day, watching the news about the bombing at the marathon,” Rodriguez told Yahoo! Sports. “It’s a strange feeling to know I sparred with this guy and knew him and talked with him. It’s not like we were friends, but we talked and had conversations. It is strange. It’s hard now, knowing what this coward did, to even think about it. He affected so many people, so many families. My heart just goes out to them.”

Rodriguez, who is ranked No. 2 at 168 pounds by the WBC and No. 3 by both the IBF and the WBA, was preparing for a fight in 2010 and was looking for quality sparring partner near his Worcester, Mass., home.

[Related: Massive manhunt ends with capture of Dzhokhar A. Tsarnaev]

There are a lot of amateurs in the area, but not many pros. The majority of amateurs aren’t qualified to give a top professional prospect like Rodriguez high-level work.